Post-hole auger



H S I S L M & T .I V E m M d 0 M 0 m POST HOLE AUGBR.

No. 352,305. Patented Nov. 9, 1886.

UNITE STATES PATENT FFICEO THOMAS 'DEVITT AND MARTIN L. SISE, OF SPRINGFIELD, OHIO.

POST-HOLE AUGER.

SPECIFICATION forming part of Letters Patent No. 352,305, dated November 9, 1886.

Application filed April 29, 18%6. Serial No. 200,593. (No model.) I

To aZZ whom it may concern:

Be it known that we, THOMAS Dnvrrr and 'MARTIN L. SIsE, citizens of the United States,

it consists, first, in the peculiar shape of the blades, which will hereinafter more fully appear; and, second, in the relative arrangement of the blades upon the handle.

In the accompanying drawings, forming a part of this specification, and on which similar letters of reference indicate the same or corresponding features, Figure 1 represents a perspective view of our improved auger entire, Fig. 2, an elevation looking at the inner side of one of the blades; Fig. 3, a side view of the auger entire; and Fig. 4c, a plan view of the blades and yoke, the handle being in section.

The letter A-designates a metallic rod, having a handle, B, at its upper end, and terminating in a yoke consisting of members 0 at its lower end, made integrally with or separately from and attached to the handle A, and flattened and provided with apertures near their ends. To these members are secured by bolts or rivets, or in any convenient manner, the blades D. These blades are constructed either entirely of sheetsteel or of sheets of iron with steel borders, so as to possess the requisite qualities of cutting the earth. Eachblade has an approximately-straight cuttingedge, E, and a dead edge, F, which form the .sides of the blades. At G the edge F is curved outwardly, and at the point H changes its direction and runs to about the vertical center of the blade at an angle approximating fortyfive degrees, forming a cuttingedge, I. At J the cutting-edge E changes its direction and runs to the point K, uniting with the cuttingedge I. The general contour of the blade is convex on the outside and concave on the inner side. This curved shape extends from the point to the upper end of the blade, and

its object is to make the blade partake somewhat of the shape of the hole which it digs,

earth and the cutting-edge than would be the case if the blade were flat. This statement that the blade is convex must be understood with the qualification that from the yoke to the cuttingedge E of each blade the curvature is less than from the yoke to the edge D, thus making the blade slightly flat from the cuttingedge E toward its vertical center, the slight flatness gradually merging in the general contour.

About on a line drawn from the point H to the point J the blade is curved at right angles to the curyatnre already spoken of, whereby the point K is turned inwardly, as more clearly seen in Figs. 3 and 4.. This feature enables the blades to hold the earth, whereby it is excavated by raising the auger from the hole. The bevel of the cutting-edgesE is on the innersideof the blade, as also the bevel of the cutting-edges of the point.

In mounting the blades upon the yoke the cutting-edge E of one blade stands about threequarters of an inch farther from the yoke than the dead edge D of the opposite blade, which has the effect of causing the cutting-edges to more readily take into the ground, While the formation of the points, as above described, induces the blades to descend or partake of a screw-like action and work downwardly.

In operating the anger the same is revolved by means of the handle B, the cutting-edges E traveling forward, as indicated by .the arrow in Fig. 4. v I

The portion of the blade seen between a and and also to present a less angle between the b in Fig. l is the principal cutting-edge, being that part of the blade which is set farthest to one side of the yoke.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

p 1. In an earth-auger, the combination, with a handle terminating in a yoke, of two cutend and curved inwardly to or about a right angle to the convexity, and having cuttingedges at both sides of the point.

In testimony whereof we affix our signatures r 5 in presence of two witnesses.

THOMAS DEVITT. MARTIN L. SISE.

Witnesses:

D. S. MoRRow, WILBER OoLVIN. 

